I just needed a simple place to put my whiteboard cleaner. I didnt add any screw holes since I just attached it with some mounting tape and it has been plenty strong. There is a hole in the middle to save on some filament, and if there were issues with tolerances to reduce any suction issues; but there isn't so….

Also this was my first 3d model…. ever…. so uhh… sorry in advance if anyone prints this! It did the trick for me though! :D